Tiêu chuẩn iso 16564 2004 amd1 2006

Reference number ISO 16564 2004/Amd 1 2006(E) © ISO 2006 INTERNATIONAL STANDARD ISO 16564 First edition 2004 10 01 AMENDMENT 1 2006 05 15 Rubber, raw natural — Determination of average molecular mass[.]

Reference number ISO 16564:2004/Amd.1:2006(E)

© ISO 2006

INTERNATIONAL STANDARD

ISO 16564

First edition 2004-10-01

AMENDMENT 1

2006-05-15

Rubber, raw natural — Determination of average molecular mass and molecular-mass distribution by size exclusion chromatography (SEC)

AMENDMENT 1

Caoutchouc naturel brut — Détermination de la masse moléculaire moyenne et de la répartition des masses moléculaires par

chromatographie d'exclusion stérique (SEC) AMENDEMENT 1

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ISO 16564:2004/Amd.1:2006(E)

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies) The work of preparing International Standards is normally carried out through ISO technical committees Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2

The main task of technical committees is to prepare International Standards Draft International Standards adopted by the technical committees are circulated to the member bodies for voting Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights ISO shall not be held responsible for identifying any or all such patent rights

Amendment 1 to ISO 16564:2004 was prepared by Technical Committee ISO/TC 45, Rubber and rubber

products, Subcommittee SC 2, Testing and analysis

ISO 16564:2004/Amd.1:2006(E)

Rubber, raw natural — Determination of average molecular

mass and molecular-mass distribution by size exclusion

chromatography (SEC)

AMENDMENT 1

Page 5

Replace Clause 8 by the following:

8 Precision

8.1 An interlaboratory test programme (ITP) was carried out using the guidelines established by

ISO/TR 9272, Rubber and rubber products — Determination of precision for test method standards, in the

period June to July 2002 A type 1 precision was determined on the basis of two measurements of molecular

mass Mw on each of two different days Each measurement is designated as a test result Homogenized natural rubber (NR) was used as the test material and each laboratory used a set of supplied polystyrene

standards for calibration Data on Mw obtained from four laboratories were used to calculate the repeatability and reproducibility

8.2 The precision results as determined by this ITP may not be applied to acceptance or rejection testing for any group of materials or products without documentation that the results of this precision evaluation actually apply to the products or materials tested

8.3 The precision results are given in Table 2 General statements for the use of the precision results are

cited below These are given in terms of both the absolute precision, r and R, and the relative precision, (r) and (R)

Repeatability: The repeatability, or local domain precision, of the test method has been established as the

values given in Table 2 Two individual test results (obtained by the proper use of this International Standard)

that differ by more than the tabulated values of r, in measurement units, or (r), in percent, shall be considered

as suspect, i.e to have come from different populations Such a decision suggests that some appropriate investigative action be taken

Reproducibility: The reproducibility, or global domain precision, of the test method has been established as

the values given in Table 2 Two individual test results obtained in different laboratories (by the proper use of

this International Standard) that differ by more than the tabulated values of R, in measurement units, and (R),

in percent, shall be considered as suspect, i.e to have come from different populations Such a decision suggests that some appropriate investigative action be taken

Bias: Bias is the difference between a measured average test result and a reference or true value for the

measurement in question Reference values do not exist for this test method and therefore bias cannot be determined

Table 2 — Precision data for Mw

Within laboratory Between laboratories Material Mean value of M

where

s r is the repeatability standard deviation;

s R is the reproducibility standard deviation;

r is the repeatability limit, in measurement units;

R is the reproducibility limit, in measurement units;

(r) is the repeatability (relative), in percent;

(R) is the reproducibility (relative), in percent